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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+3.1%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$34.4B
AUM Growth
+$328M
Cap. Flow
-$18.6M
Cap. Flow %
-0.05%
Top 10 Hldgs %
25.12%
Holding
1,903
New
83
Increased
650
Reduced
792
Closed
87

Top Buys

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$80.6M
2
BLK icon
Blackrock
BLK
+$53.4M
3
CWAN
Clearwater Analytics
CWAN
+$48.5M
4
NVDA icon
NVIDIA
NVDA
+$47.9M
5
BWXT icon
BWX Technologies
BWXT
+$47M

Top Sells

Rank Stock Value
1
DXCM icon
DexCom
DXCM
+$37.7M
2
CSGP icon
CoStar Group
CSGP
+$34.5M
3
VRTX icon
Vertex Pharmaceuticals
VRTX
+$30M
4
BAH icon
Booz Allen Hamilton
BAH
+$29.1M
5
IDXX icon
Idexx Laboratories
IDXX
+$26.6M

Sector Composition

Rank Sector Weight
1 Technology 28.35%
2 Financials 13.43%
3 Healthcare 12.44%
4 Industrials 11.81%
5 Consumer Discretionary 8.44%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IJH icon
151
iShares Core S&P Mid-Cap ETF
IJH
$128B
$42M 0.12%
674,080
+20,262
+3% +$1.3M
CAT icon
152
Caterpillar
CAT
$393B
$41.9M 0.12%
115,391
+1,174
+1% +$455K
BMY icon
153
Bristol-Myers Squibb
BMY
$130B
$41.6M 0.12%
734,969
+198,245
+37% +$11.1M
GLD icon
154
SPDR Gold Trust
GLD
$144B
$41.3M 0.12%
170,588
+4,834
+3% +$1.19M
NDAQ icon
155
Nasdaq
NDAQ
$53.5B
$41.2M 0.12%
532,581
+255,259
+92% +$19.7M
RTX icon
156
RTX Corp
RTX
$300B
$41M 0.12%
354,652
-197
-0.1% -$23.8K
IWD icon
157
iShares Russell 1000 Value ETF
IWD
$84B
$39.6M 0.12%
214,045
-6,319
-3% -$1.21M
MDY icon
158
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27.2B
$39.4M 0.11%
69,120
-359
-0.5% -$210K
EW icon
159
Edwards Lifesciences
EW
$53.6B
$39M 0.11%
526,292
-77,310
-13% -$5.41M
SCHD icon
160
Schwab US Dividend Equity ETF
SCHD
$107B
$38.7M 0.11%
1,417,933
+236,584
+20% +$6.73M
ULS icon
161
UL Solutions
ULS
$15.5B
$38.6M 0.11%
774,059
+50,875
+7% +$2.64M
MCHP icon
162
Microchip Technology
MCHP
$43.1B
$38.5M 0.11%
671,287
-321,104
-32% -$22.1M
GILD icon
163
Gilead Sciences
GILD
$168B
$38.2M 0.11%
413,430
-8,040
-2% -$724K
FLYW icon
164
Flywire
FLYW
$2.12B
$38.2M 0.11%
1,850,980
-36,187
-2% -$707K
SPMD icon
165
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$19B
$37.5M 0.11%
686,127
+113,848
+20% +$6.41M
NEOG icon
166
Neogen
NEOG
$2.5B
$37.5M 0.11%
3,090,014
-662,921
-18% -$9.27M
KNSL icon
167
Kinsale Capital Group
KNSL
$8.51B
$37.5M 0.11%
80,629
+4,363
+6% +$2.07M
IJR icon
168
iShares Core S&P Small-Cap ETF
IJR
$113B
$37.4M 0.11%
324,269
+22,629
+8% +$2.7M
DSGX icon
169
Descartes Systems
DSGX
$6.65B
$37M 0.11%
325,958
+11,560
+4% +$1.29M
BJ icon
170
BJs Wholesale Club
BJ
$11.8B
$36.9M 0.11%
413,495
+101,625
+33% +$9.19M
IRM icon
171
Iron Mountain
IRM
$37B
$35.2M 0.1%
334,522
+578
+0.2% +$67.9K
CBZ icon
172
CBIZ
CBZ
$2.96B
$34.6M 0.1%
422,866
+17,024
+4% +$1.27M
ZBRA icon
173
Zebra Technologies
ZBRA
$17.9B
$34.3M 0.1%
88,855
-887
-1% -$344K
DOCU
174
DocuSign
DOCU
$11.1B
$34.3M 0.1%
381,082
-15,961
-4% -$1.27M
WST icon
175
West Pharmaceutical
WST
$24.8B
$34M 0.1%
103,866
+2,656
+3% +$836K
5 6
7
8 9

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William Blair & Company's Q4 2024 Portfolio in Review

As of Q4 2024, William Blair & Company held 1,903 positions worth $34.4B, up 0.96% from $34.1B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q4 2024 filing shows 83 new, 650 increased, 792 reduced and 87 closed positions. Its largest new stake was Blackrock: 52,623 shares worth $53.9M. The largest sale was DexCom, an estimated $37.7M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 27% a quarter earlier, followed by Financials and Healthcare.

  • William Blair & Company's largest Q4 2024 buy was Blackrock: 52,623 shares worth $53.9M.
  • William Blair & Company added most to Block Inc in Q4 2024, an estimated $80.6M increase.
  • William Blair & Company's biggest Q4 2024 reduction was DexCom, cutting an estimated $37.7M.
  • William Blair & Company fully exited Rush Street Interactive in Q4 2024, selling an estimated $5.79M.
  • William Blair & Company's ten largest holdings make up 25% of its $34.4B portfolio in Q4 2024.
  • William Blair & Company opened 83 new positions and closed 87 in Q4 2024.
  • William Blair & Company's portfolio value rose 0.96% quarter-over-quarter to $34.4B.

Based on William Blair & Company's 13F filing for Q4 2024, filed 12 Feb 2025.